Seat Ibiza puttering white smoke out exhaust

Check your coolant level first and engine oil level also and get back with findings

Water level between min & max. Oil level same
That much smoke it’s undrivable smells of oil

White smoke usually signifies coolant burning in engine or fuel injector faulty .From what you describe it sounds like injector over fueling .

It does not seem to be missing and revs up ok would an injector make it smell of oil

It could do . You could try injector cleaner as a possible quick fix